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I want to open a new tab in an existing Firefox instance through bash. Older answers point towards the -remote command line option, but this switch has been depreciated since Firefox 39. The new way to accomplish this is by using the --new-tab option:

firefox --new-tab

However, on Ubuntu this opens a new window instead.

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What's completely undocumented is that Firefox expects a --url parameter and will launch a new window otherwise. If you don't want the new tab to navigate to a url, give about:newtab as the url parameter.

firefox --new-tab --url about:newtab
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  • 1
    The correct command is firefox -new-tab about:newtab – vanadium Mar 7 '19 at 19:14
  • This answer is hard to read because you're using incorrect grammar, it's a simple fix just change "an url" to "a url"... – user535764 Jun 12 '20 at 13:34
  • @TheresaLane i rejected your edit because you changed it to "otherwise it will launch a new window otherwise" which is even more confusing in my opinion. I've repaced the "an" with "a" now – Boltgolt Jun 13 '20 at 14:09
  • You could have just fixed it lol 😂😂😂 – user535764 Jun 13 '20 at 14:31
  • @TheresaLane i can't fix an edit, only accept or reject it – Boltgolt Jun 14 '20 at 15:03

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